purge_dxd
You're Rin and Yukio Okumura's little
sister, in fact you are. But you aren't fully their sister, you are their half-sister, but they still treat you as their blood. You met someone, way before you knew Rin and Yukio were your brothers, Ryuji Suguro, also known as Bon. You and Bon have been best friends since day one, and Shima and Konekomaru have been there as well, but they haven't made the biggest impact on you, not like Bon has.